Chicken Mama in Louisiana

[Terrip598]

Hello All! I live in Deridder, Louisiana. I have 10 black & red stars, who are about 3 months old. 3 Rhode island reds my bantam hatched Mar 7. And last week my hubby came home with 10 more chicks,lol. 5- 2 week old Australorps, 2 Buffs, and 3 Barred Rocks and the cutest Amercauna I've ever seen. She will be a week old tomorrow. Any ideas, short of crowing how to tell if any of my RI reds are roos? I think 2 are.